Warning: Permanently added '10.128.0.200' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 153.831313][ T9837] general protection fault, probably for non-canonical address 0xdffffc0000000021: 0000 [#1] PREEMPT SMP KASAN [ 153.843100][ T9837] KASAN: null-ptr-deref in range [0x0000000000000108-0x000000000000010f] [ 153.851493][ T9837] CPU: 0 PID: 9837 Comm: syz-executor063 Not tainted 5.6.0-rc3-next-20200228-syzkaller #0 [ 153.861352][ T9837] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 153.871427][ T9837] RIP: 0010:destroy_workqueue+0x2e/0x6b0 [ 153.877085][ T9837] Code: 49 89 fe 41 55 41 54 55 53 48 83 ec 08 e8 8a 6a 26 00 49 8d be 08 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 e0 05 00 00 49 8b 9e 08 01 00 00 48 85 db 74 19 [ 153.896699][ T9837] RSP: 0018:ffffc90001ff7cc8 EFLAGS: 00010206 [ 153.902747][ T9837] RAX: dffffc0000000000 RBX: 0000000000000002 RCX: 0000000000000000 [ 153.910694][ T9837] RDX: 0000000000000021 RSI: ffffffff814c2af6 RDI: 0000000000000108 [ 153.918646][ T9837] RBP: ffff888218ae08f0 R08: ffff88809f4f02c0 R09: fffffbfff185270a [ 153.926651][ T9837] R10: fffffbfff1852709 R11: ffffffff8c29384f R12: ffff888218ae0800 [ 153.934607][ T9837] R13: ffff888218ae0804 R14: 0000000000000000 R15: 0000000000004c01 [ 153.942591][ T9837] FS: 00000000012ca880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 153.951692][ T9837] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 153.958252][ T9837] CR2: 00007f449de6f110 CR3: 00000000a9249000 CR4: 00000000001406f0 [ 153.966209][ T9837] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 153.974157][ T9837] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 153.982100][ T9837] Call Trace: [ 153.985375][ T9837] __loop_clr_fd+0x185/0x1280 [ 153.990049][ T9837] lo_ioctl+0x2b4/0x1460 [ 153.994288][ T9837] ? __loop_clr_fd+0x1280/0x1280 [ 153.999218][ T9837] blkdev_ioctl+0x25b/0x660 [ 154.003712][ T9837] ? blkdev_common_ioctl+0x1770/0x1770 [ 154.009151][ T9837] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 154.015123][ T9837] block_ioctl+0xe9/0x130 [ 154.019432][ T9837] ? blkdev_fallocate+0x3f0/0x3f0 [ 154.024440][ T9837] ksys_ioctl+0x11a/0x180 [ 154.028774][ T9837] __x64_sys_ioctl+0x6f/0xb0 [ 154.033366][ T9837] ? lockdep_hardirqs_on+0x417/0x5d0 [ 154.038644][ T9837] do_syscall_64+0xf6/0x790 [ 154.043128][ T9837] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 154.048997][ T9837] RIP: 0033:0x44a5a7 [ 154.052870][ T9837] Code: 48 83 c4 08 48 89 d8 5b 5d c3 66 0f 1f 84 00 00 00 00 00 48 89 e8 48 f7 d8 48 39 c3 0f 92 c0 eb 92 66 90 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 0d cc fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 154.072450][ T9837] RSP: 002b:00007ffd45d19aa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 154.080835][ T9837] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000044a5a7 [ 154.088789][ T9837] RDX: 0000000000000000 RSI: 0000000000004c01 RDI: 0000000000000003 [ 154.096735][ T9837] RBP: 000000000002572d R08: 0000000000000000 R09: 000000000000000a [ 154.104682][ T9837] R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000407640 [ 154.112630][ T9837] R13: 00000000004076d0 R14: 0000000000000000 R15: 0000000000000000 [ 154.120583][ T9837] Modules linked in: [ 154.125204][ T9837] ---[ end trace ac0b9ae72f84c041 ]--- [ 154.130722][ T9837] RIP: 0010:destroy_workqueue+0x2e/0x6b0 [ 154.136419][ T9837] Code: 49 89 fe 41 55 41 54 55 53 48 83 ec 08 e8 8a 6a 26 00 49 8d be 08 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 e0 05 00 00 49 8b 9e 08 01 00 00 48 85 db 74 19 [ 154.156070][ T9837] RSP: 0018:ffffc90001ff7cc8 EFLAGS: 00010206 [ 154.162167][ T9837] RAX: dffffc0000000000 RBX: 0000000000000002 RCX: 0000000000000000 [ 154.170168][ T9837] RDX: 0000000000000021 RSI: ffffffff814c2af6 RDI: 0000000000000108 [ 154.178153][ T9837] RBP: ffff888218ae08f0 R08: ffff88809f4f02c0 R09: fffffbfff185270a [ 154.186151][ T9837] R10: fffffbfff1852709 R11: ffffffff8c29384f R12: ffff888218ae0800 [ 154.194153][ T9837] R13: ffff888218ae0804 R14: 0000000000000000 R15: 0000000000004c01 [ 154.202150][ T9837] FS: 00000000012ca880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 154.211070][ T9837] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 154.217679][ T9837] CR2: 00007f449de6f110 CR3: 00000000a9249000 CR4: 00000000001406f0 [ 154.225670][ T9837] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 154.233658][ T9837] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 154.241689][ T9837] Kernel panic - not syncing: Fatal exception [ 154.248687][ T9837] Kernel Offset: disabled [ 154.253020][ T9837] Rebooting in 86400 seconds..